can some one please help me please Science Assignment Help

I need help with my supply chain management class ( <span style='font-size:11.0pt;font-family:
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PLANNING AND CONTROL)

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Which of the following aqueous solutions will or will not act as a buffer solution? 

H₂SO₃ and NaHSO₃ 

HBr and KI 

HClO₄ and NaClO₄ 

 CH₃CO₂K and CH₃CO₂Na 

 NaOH and NaCl 

NaH₂PO₄ and Na₂HPO₄ 

Which has the smallest vapour pressure at 25°C

 SiO₂  CO₂  H₂O 
Which has the highest normal boiling point NH₃  CH₄  H₂O Which has the least viscosity CH₃CH₂OH  HOCH₂CH₂OH  HOCH₂CH₂OH 
Which has the greatest heat of vaporization H₂Te H₂Se 

 H₂O  H₂S 

 Are the structural units atoms in a covalent network, ions in an ionic lattice, atoms in a metallic lattice, or molecules in a molecular solid? Enter your answer as a sequence of letters. Select C for atoms in a covalent network, I for ions in an ionic lattice, M for atoms in a metallic lattice, and A for molecules in a molecular solid. For example, if the first and third and sixth are A, the second and fourth are M, the fifth is I, and the last one is C, enter AMAMIAC). 
A) diamond 
B) tungsten 
C) dry ice (carbon dioxide) 
D) chromium 
E) phosphorus 
F) copper nitrate 

G) sodium